Water Turbidity

AUS-TGP-URB-WTU General High confidence

Benchmark Value

5 NTU

Range: — to 10 NTU

Thresholds: Lower: —, Upper: 35

Optimal Range: — to 10

Direction: Lower is desirable ↓

Form: MaximumOnly

Scoring Curve

This curve shows how a field measurement for this indicator would score across all available benchmark forms in this context. The scoring engine uses 5 benchmarks together — the OptimalRange form drives the primary score, while 4 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary MaximumOnly Guard Point Guard MaximumOnly Guard OptimalRange Guard

Evidence & Context

A value of < 5 NTU represents a robust and realistic target for the best available condition of an urban stream under exemplary management.

Metric Definition:

Water turbidity measured in Nephelometric Turbidity Units (NTU), indicating water clarity or lack thereof.

Benchmark Definition:

This benchmark represents the maximum water turbidity level for a well-managed urban stream in Australia's Temperate Grassy Woodlands & Plains biome, indicating water clarity that supports ecological health.

Justification:

This benchmark represents the median turbidity achievable in a well-managed urban stream that mimics the condition of a healthy, vegetated reference system, derived from real-world measurements and national guidelines.

Sources (3)

Preview of Assessing Water Quality - Secondary Education Years 9 to 12 - Upper Murrumbidgee Waterwatch, accessed August 12, 2025,

Assessing Water Quality - Secondary Education Years 9 to 12 - Upper Murrumbidgee Waterwatch, accessed August 12, 2025, Journal

Assessing water quality - ACT Waterwatch

Preview of Timeline of the Little Stringybark Creek (LSC) project. Ecological ..., accessed August 11, 2025,

Timeline of the Little Stringybark Creek (LSC) project. Ecological ..., accessed August 11, 2025, GreyLiterature

Timeline of the Little Stringybark Creek (LSC) project. Ecological - ResearchGate, accessed August 11, 2025

Preview of Water Quality Monitoring in the Upper Ourimbah Creek Catchment | EPA, accessed August 11, 2025,

Water Quality Monitoring in the Upper Ourimbah Creek Catchment | EPA, accessed August 11, 2025, Government

Water Quality Monitoring in the Upper Ourimbah Creek Catchment | EPA, accessed August 11, 2025,

Supporting Sources (41)

Additional references from the underlying research that informed this benchmark.

Preview of 1.1.7.1 Ecological systems - Bioregional Assessments |, accessed August 11, 2025,

1.1.7.1 Ecological systems - Bioregional Assessments |, accessed August 11, 2025,

Contextual Support Government

1.1.7.1 Ecological systems - Bioregional Assessments |, accessed August 11, 2025,

Preview of Bioregional and subregional framework | Biodiversity - Environment and Heritage, accessed August 11, 2025,

Bioregional and subregional framework | Biodiversity - Environment and Heritage, accessed August 11, 2025,

Contextual Support Government

Bioregional and subregional framework | Biodiversity - Environment and Heritage, accessed August 11, 2025,

Preview of Chapter 9 AUSTRALIAN GRASSLANDS - Food and Agriculture Organization of the United Nations, accessed August 5, 2025,

Chapter 9 AUSTRALIAN GRASSLANDS - Food and Agriculture Organization of the United Nations, accessed August 5, 2025,

Contextual Support Government

Karst and agriculture in Australia - Digital Commons @ USF, accessed July 26, 2025,

Preview of Characterising the relationship between water quality and water quantity, accessed August 5, 2025

Characterising the relationship between water quality and water quantity, accessed August 5, 2025

Contextual Support Journal

Report Card 2022-23 - EPA Victoria

Preview of Cities as water supply catchments – Stream ecology, accessed August 11, 2025,

Cities as water supply catchments – Stream ecology, accessed August 11, 2025,

Contextual Support Journal

Cities as water supply catchments – Stream ecology, accessed August 11, 2025,

Preview of City of Port Phillip WSUD Guidelines, accessed August 11, 2025,

City of Port Phillip WSUD Guidelines, accessed August 11, 2025,

Contextual Support Journal

City of Port Phillip WSUD Guidelines, accessed August 11, 2025,

Preview of Effects of Sedimentation and Turbidity on Lotic Food Webs: A Concise Review for Natural Resource Managers - Southern Research Station, accessed July 16, 2025,

Effects of Sedimentation and Turbidity on Lotic Food Webs: A Concise Review for Natural Resource Managers - Southern Research Station, accessed July 16, 2025,

Contextual Support Journal

Effects of Sedimentation and Turbidity on Lotic Food Webs: A Concise Review for Natural Resource Managers - Southern Research Station, accessed August 17, 2025

Preview of Effects of Turbid Water on Fish Ecology in Streams and Dam Reservoirs - Korea Science, accessed August 11, 2025,

Effects of Turbid Water on Fish Ecology in Streams and Dam Reservoirs - Korea Science, accessed August 11, 2025,

Contextual Support Journal

Effects of Turbid Water on Fish Ecology in Streams and Dam Reservoirs - Korea Science, accessed August 11, 2025,

Preview of Ensuring protection of Little Stringybark Creek - Tasmanian Planning Commission, accessed August 11, 2025,

Ensuring protection of Little Stringybark Creek - Tasmanian Planning Commission, accessed August 11, 2025,

Contextual Support Journal

Ensuring protection of Little Stringybark Creek - Tasmanian Planning Commission, accessed August 11, 2025

Preview of ESTABLISHING THE RELATIONSHIP BETWEEN TURBIDITY AND TOTAL SUSPENDED SEDIMENT CONCENTRATION, accessed August 11, 2025,

ESTABLISHING THE RELATIONSHIP BETWEEN TURBIDITY AND TOTAL SUSPENDED SEDIMENT CONCENTRATION, accessed August 11, 2025,

Contextual Support

ESTABLISHING THE RELATIONSHIP BETWEEN TURBIDITY AND TOTAL SUSPENDED SEDIMENT CONCENTRATION, accessed August 11, 2025,

Preview of Full article: Impacts of urbanisation on hydrological and water quality dynamics, and urban water management: a review - Taylor & Francis Online, accessed August 11, 2025,

Full article: Impacts of urbanisation on hydrological and water quality dynamics, and urban water management: a review - Taylor & Francis Online, accessed August 11, 2025,

Contextual Support

Full article: Impacts of urbanisation on hydrological and water quality dynamics, and urban water management: a review - Taylor & Francis Online, accessed August 11, 2025,

Preview of Gippsland Plains Grassy Woodland - Wikipedia, accessed August 11, 2025,

Gippsland Plains Grassy Woodland - Wikipedia, accessed August 11, 2025,

Contextual Support GreyLiterature

Gippsland Plains Grassy Woodland - Wikipedia

Preview of How Much Is Enough? Minimal Responses of Water Quality and Stream Biota to Partial Retrofit Stormwater Management in a Suburban Neighborhood | PLOS One, accessed August 11, 2025,

How Much Is Enough? Minimal Responses of Water Quality and Stream Biota to Partial Retrofit Stormwater Management in a Suburban Neighborhood | PLOS One, accessed August 11, 2025,

Contextual Support Journal

How Much Is Enough? Minimal Responses of Water Quality and Stream Biota to Partial Retrofit Stormwater Management in a Suburban Neighborhood | PLOS One, accessed August 11, 2025,

Preview of Hugh P. Duncan's research works | Monash University (Australia) and other places, accessed August 11, 2025,

Hugh P. Duncan's research works | Monash University (Australia) and other places, accessed August 11, 2025,

Contextual Support GreyLiterature

Hugh P. Duncan's research works | Monash University (Australia) and other places, accessed August 11, 2025,

Preview of LITTLE STRINGYBARK CREEK - urbanstreams.net, accessed August 11, 2025,

LITTLE STRINGYBARK CREEK - urbanstreams.net, accessed August 11, 2025,

Contextual Support Direct Evidence Journal

LITTLE STRINGYBARK CREEK - urbanstreams.net, accessed August 11, 2025,

Preview of National Guidelines for Water Quality - Department of Natural Resources and Environment Tasmania, accessed August 1, 2025,

National Guidelines for Water Quality - Department of Natural Resources and Environment Tasmania, accessed August 1, 2025,

Contextual Support

Australian and New Zealand Guidelines for Fresh and Marine Water ...

Preview of NVIS Fact sheet MVG 19 6 Tussock grasslands, accessed July 16, 2025,

NVIS Fact sheet MVG 19 6 Tussock grasslands, accessed July 16, 2025,

Contextual Support Journal

Understanding soil pH, accessed August 28, 2025,

Preview of River health and monitoring | Melbourne Water, accessed August 11, 2025,

River health and monitoring | Melbourne Water, accessed August 11, 2025,

Contextual Support Government

River health and monitoring | Melbourne Water, accessed August 11, 2025,

Preview of Southeast Australia temperate savanna - Wikipedia, accessed August 4, 2025

Southeast Australia temperate savanna - Wikipedia, accessed August 4, 2025

Contextual Support

Southeast Australia temperate savanna - Wikipedia

Preview of Stream health in the Lane Cove River and Middle Harbour Catchments - City of Ryde, accessed August 11, 2025,

Stream health in the Lane Cove River and Middle Harbour Catchments - City of Ryde, accessed August 11, 2025,

Contextual Support Journal

Stream health in the Lane Cove River and Middle Harbour Catchments - City of Ryde, accessed August 11, 2025,

Preview of Stream Restoration through Stormwater Runoff Management and Retrofit: New Objectives, New Approaches | Proceedings | Vol , No - ASCE Library, accessed August 11, 2025,

Stream Restoration through Stormwater Runoff Management and Retrofit: New Objectives, New Approaches | Proceedings | Vol , No - ASCE Library, accessed August 11, 2025,

Contextual Support GreyLiterature

Stream Restoration through Stormwater Runoff Management and Retrofit: New Objectives, New Approaches | Proceedings | Vol , No - ASCE Library, accessed August 11, 2025,

Preview of Technical Design Guidelines - for South East Queensland - Redland City Council, accessed August 11, 2025,

Technical Design Guidelines - for South East Queensland - Redland City Council, accessed August 11, 2025,

Contextual Support

Technical Design Guidelines - for South East Queensland - Redland City Council, accessed August 11, 2025,

Preview of Temperate Grasslands - Greening Australia, accessed August 4, 2025

Temperate Grasslands - Greening Australia, accessed August 4, 2025

Contextual Support Journal

Managing natural areas | City of Gold Coast, accessed May 19, 2025

Preview of The influence of concrete on the geochemical qualities of urban streams - CSIRO PUBLISHING | Marine and Freshwater Research, accessed August 11, 2025,

The influence of concrete on the geochemical qualities of urban streams - CSIRO PUBLISHING | Marine and Freshwater Research, accessed August 11, 2025,

Contextual Support Journal

The influence of concrete on the geochemical qualities of urban streams - CSIRO PUBLISHING | Marine and Freshwater Research, accessed July 13, 2025,

Preview of Turbidity - Cumberland River Compact, accessed August 12, 2025,

Turbidity - Cumberland River Compact, accessed August 12, 2025,

Contextual Support GreyLiterature

Turbidity - Cumberland River Compact, accessed July 31, 2025,

Preview of Turbidity & TSS - LakeSuperiorStreams, accessed August 11, 2025,

Turbidity & TSS - LakeSuperiorStreams, accessed August 11, 2025,

Contextual Support GreyLiterature

Turbidity & TSS - LakeSuperiorStreams, accessed August 11, 2025,

Preview of Turbidity | Australian Drinking Water Guidelines - NHMRC, accessed August 11, 2025,

Turbidity | Australian Drinking Water Guidelines - NHMRC, accessed August 11, 2025,

Contextual Support Regulatory Framework Government

Australian Drinking Water Guidelines

Preview of Turbidity and TSS: water clarity insights - LG Sonic, accessed August 11, 2025,

Turbidity and TSS: water clarity insights - LG Sonic, accessed August 11, 2025,

Contextual Support GreyLiterature

Turbidity and TSS: water clarity insights - LG Sonic, accessed August 11, 2025,

Preview of Turbidity, accessed August 3, 2025,

Turbidity, accessed August 3, 2025,

Contextual Support Journal

Turbidity, accessed July 31, 2025,

Preview of Understanding Water Sensitive Urban Design (WSUD) And How Certified Energy Ensures Compliance, accessed August 11, 2025,

Understanding Water Sensitive Urban Design (WSUD) And How Certified Energy Ensures Compliance, accessed August 11, 2025,

Contextual Support

Understanding Water Sensitive Urban Design (WSUD) And How Certified Energy Ensures Compliance, accessed August 11, 2025,

Preview of urbanstreams.net – Stream ecology, Raingarden Diary, Chris Walsh's blog, accessed August 11, 2025,

urbanstreams.net – Stream ecology, Raingarden Diary, Chris Walsh's blog, accessed August 11, 2025,

Contextual Support GreyLiterature

urbanstreams.net – Stream ecology, Raingarden Diary, Chris Walsh's blog, accessed August 11, 2025,

Preview of Water quality - Healthy Waterways Strategy, accessed August 11, 2025,

Water quality - Healthy Waterways Strategy, accessed August 11, 2025,

Contextual Support Government

Water quality - Healthy Waterways Strategy, accessed August 12, 2025,

Preview of Water quality and pollution - Yarra Riverkeeper Association, accessed August 11, 2025,

Water quality and pollution - Yarra Riverkeeper Association, accessed August 11, 2025,

Contextual Support GreyLiterature

Water quality and pollution - Yarra Riverkeeper Association, accessed August 11, 2025,

Preview of Water Quality Objectives - Border Rivers - NSW Government, accessed August 12, 2025

Water Quality Objectives - Border Rivers - NSW Government, accessed August 12, 2025

Contextual Support Government

(PDF) Impact of mitigated forestry activities on turbidity: assessing ..., accessed August 10, 2025

Preview of Water Quality Standards - Turbidity Technical Review - Oregon.gov, accessed August 11, 2025,

Water Quality Standards - Turbidity Technical Review - Oregon.gov, accessed August 11, 2025,

Contextual Support Journal

Water Quality Standards - Turbidity Technical Review - Oregon.gov

Preview of Water Sensitive Urban Design - Townsville City Council, accessed August 2, 2025,

Water Sensitive Urban Design - Townsville City Council, accessed August 2, 2025,

Contextual Support Journal

Water Sensitive Urban Design - Townsville City Council, accessed August 1, 2025,

Preview of Water Sensitive Urban Design Guidelines - Melbourne Water, accessed July 21, 2025,

Water Sensitive Urban Design Guidelines - Melbourne Water, accessed July 21, 2025,

Contextual Support Journal

Section 13 – Water Sensitive Urban Design (WSUD) Guidelines - City of Gold Coast, accessed July 13, 2025

Preview of Water Sensitive Urban Design Guidelines Wollondilly Shire Council, accessed August 11, 2025,

Water Sensitive Urban Design Guidelines Wollondilly Shire Council, accessed August 11, 2025,

Contextual Support

Water Sensitive Urban Design Guidelines Wollondilly Shire Council, accessed August 1, 2025,

Preview of Water Sensitive Urban Design Report - NET, accessed August 11, 2025,

Water Sensitive Urban Design Report - NET, accessed August 11, 2025,

Contextual Support Journal

Water Sensitive Urban Design Report - NET, accessed August 11, 2025,

Preview of Water-sensitive urban design - Wikipedia, accessed August 11, 2025,

Water-sensitive urban design - Wikipedia, accessed August 11, 2025,

Contextual Support GreyLiterature

Water-sensitive urban design - Wikipedia, accessed July 26, 2025

Preview of Why Measure Turbidity? - Montclair State University, accessed August 12, 2025,

Why Measure Turbidity? - Montclair State University, accessed August 12, 2025,

Contextual Support GreyLiterature

Feral horses (Equus caballus) increase suspended sediment in subalpine streams, accessed August 3, 2025

Context

Region Australia
Biome Temperate Grassy Woodlands & Plains
Land Use Urban & Developed Use
Assessment Conservation Target
Evidence Type ReferenceCondition

Lifecycle

Status Active
Version 1
Effective From 15 Mar 2026

Notes

Lower turbidity is consistently associated with higher ecological health; no detrimental lower threshold exists. Optimal turbidity is consistently < 10 NTU, with < 5 NTU representing excellent condition. Chronic turbidity above 35 NTU causes significant ecological harm.